15. Calculate the pH of an aqueous solution of a strong monobasic acid at a concentration of 0.001; 0.01; 0.1; 0.5; 1 mol/l (excluding and including ionic strength). Activity coefficients f at ionic strength Ic = 0.001; 0.01; 0.1; 0.5; 1 are f(H30 ) = 0.967; 0.914; 0.81; 0.99. What is the relative and absolute error?

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